US8752785B2 - Semi-levered articulated landing gear system - Google Patents

Semi-levered articulated landing gear system Download PDF

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Publication number
US8752785B2
US8752785B2 US13/531,650 US201213531650A US8752785B2 US 8752785 B2 US8752785 B2 US 8752785B2 US 201213531650 A US201213531650 A US 201213531650A US 8752785 B2 US8752785 B2 US 8752785B2
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United States
Prior art keywords
landing gear
gear system
axis
spindle
shock strut
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US13/531,650
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US20130341457A1 (en
Inventor
Phillip K. Wilson
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Bell Helicopter Textron Inc
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Bell Helicopter Textron Inc
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Publication date
Application filed by Bell Helicopter Textron Inc filed Critical Bell Helicopter Textron Inc
Priority to US13/531,650 priority Critical patent/US8752785B2/en
Assigned to BELL HELICOPTER TEXTRON INC. reassignment BELL HELICOPTER TEXTRON INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: Wilson, Phillip K.
Priority to EP12190536.8A priority patent/EP2679488B1/fr
Priority to CA2818053A priority patent/CA2818053C/fr
Priority to BR102013014832A priority patent/BR102013014832A2/pt
Publication of US20130341457A1 publication Critical patent/US20130341457A1/en
Application granted granted Critical
Publication of US8752785B2 publication Critical patent/US8752785B2/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C25/00—Alighting gear
    • B64C25/02—Undercarriages
    • B64C25/08—Undercarriages non-fixed, e.g. jettisonable
    • B64C25/10—Undercarriages non-fixed, e.g. jettisonable retractable, foldable, or the like
    • B64C25/14—Undercarriages non-fixed, e.g. jettisonable retractable, foldable, or the like fore-and-aft
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C27/00—Rotorcraft; Rotors peculiar thereto

Definitions

  • the present application relates to a landing gear system for an aircraft.
  • Conventional landing gear systems can be configured with a plurality of articulated members so as to be selectively retractable and deployable. Further, conventional landing gear systems can include a shock strut configured to stroke during a landing phase of the aircraft. In one conventional landing gear configuration, the geometric configuration of the members of the articulated members causes the tire member to primarily translate outboard during the stroke of the shock strut, otherwise known as a “scrubbing” of the tire member. Scrubbing of the tire can reduce the life of the tire, as well as cause irregular stroking of the shock strut.
  • FIG. 1 is a side view of an aircraft having a landing gear system, according to one example embodiment
  • FIG. 2 is a side detail view of the landing gear system, according to one example embodiment
  • FIG. 3 is a side view looking inboard of the landing gear system, according to one example embodiment
  • FIG. 4 is a view looking aft of the landing gear system, according to one example embodiment
  • FIG. 5 is a view looking aft of the landing gear system, taken from section lines 5 - 5 in FIG. 3 , according to one example embodiment
  • FIG. 6 is a view of the landing gear system in a retracted position, according to one example embodiment
  • FIG. 7 is a view of the landing gear system in a retracted position, according to one example embodiment
  • FIG. 8 is a view looking down of the landing gear system, according to one example embodiment.
  • FIG. 9A is a view looking inboard of the landing gear system in a fully extended position, according to one example embodiment
  • FIG. 9B is a view looking inboard of the landing gear system in a static position, according to one example embodiment.
  • FIG. 9C is a view looking inboard of the landing gear system in a fully compressed position, according to one example embodiment
  • FIG. 10A is a view looking aft of the landing gear system in a fully extended position, according to one example embodiment
  • FIG. 10B is a view looking aft of the landing gear system in a static position, according to one example embodiment.
  • FIG. 10C is a view looking aft of the landing gear system in a fully compressed position, according to one example embodiment.
  • the landing gear system of the present application is a retractable wheeled landing gear for an aircraft. More specifically, the landing gear system of the present application is a main landing gear for a helicopter.
  • the geometric configuration of the landing gear system causes the tire member to move or roll in fore/aft direction along an arcing path during a stroke translation of the shock strut, thereby reducing tire scrubbing and providing a smooth stroking of the shock strut.
  • Rotorcraft 101 has a rotor system 103 with a plurality of rotor blades 105 .
  • the pitch of each rotor blade 105 can be selectively controlled in order to selectively control direction, thrust, and lift of rotorcraft 101 .
  • Rotorcraft 101 further includes a fuselage 107 , anti-torque system 109 , and an empennage 111 .
  • Rotorcraft 101 further includes a retractable main landing gear system 113 , operable in conjunction with a retractable front gear 115 , to provide ground support for the aircraft.
  • Rotorcraft 101 is illustrated in conjunction with landing gear system 113 to provide structural and cooperative interrelationship between the landing gear system 113 and the fuselage structure.
  • landing gear system 113 is illustrated as the left side main landing gear; however, it should be fully appreciated that the right side main landing gear is a mirror image of the left side main landing gear, as one of ordinary skill in the art would fully appreciate having benefit of this disclosure. As such, the disclosure herein pertaining to landing gear system 113 as the left side main landing gear equally applies to the right side main landing gear.
  • rotorcraft 101 is merely illustrative of a wide variety of aircraft that can implement landing gear system 113 . Further, even though landing gear system 113 is particularly well suited for a helicopter, landing gear system 113 may be implemented on other aircraft, such as fixed wing aircraft, tilt rotor aircraft, unmanned aircraft, gyrocopters, and spacecraft, to name a few examples.
  • landing gear system 113 is illustrated in further detail.
  • Primary components of landing gear system 113 include a strut assembly 203 , a drag brace assembly 205 , and a radius rod 207 .
  • strut assembly 203 includes a fixed length portion 211 coupled to an airframe 213 of fuselage 107 via a universal joint 215 .
  • Universal joint 215 includes a clevis fitting 219 pivotally coupled to a trunnion 217 .
  • Clevis fitting 219 is rotatable about a clevis axis that is approximately parallel to a longitudinal axis of aircraft 101 when the landing gear system 113 is in a static position.
  • Trunnion 217 is rotatably coupled to airframe 213 with bearings to allow trunnion 217 to rotate about a retraction rotation axis 221 .
  • Strut assembly 203 further includes a collar 223 that is configured to rotate about a centerline axis 225 of fixed length portion 211 .
  • Collar 223 is axially restricted along centerline axis 225 so that inputs from drag brace assembly 205 can retract and deploy strut assembly 203 .
  • Strut assembly 203 further includes a shock absorber portion having a housing 227 which receives a piston rod 229 .
  • Piston rod 229 is configured to slidingly translate relative to housing 227 along centerline axis 225 .
  • Piston rod 229 and housing 227 include internal components for functionality of a shock absorber, such as an oleo strut shock absorber.
  • internal components can include a working fluid, such as air, oil, or combination thereof, in conjunction with chambers and orifices that can produce desired spring and damping characteristics, as known to one of ordinary skill in the art. It should be appreciated that the exact configuration of the shock absorber portion of strut assembly 203 is implementation specific.
  • An axle spindle 231 is fixedly coupled to piston rod 229 via an elbow 235 .
  • Axle spindle 231 is configured for the rotation of tire member 209 about an axle spindle axis 233 .
  • Centerline axis 225 intersects axle spindle axis 233 at angle A1.
  • angle A1 is approximately 120 degrees.
  • landing gear system 113 is configured so that a vertical stroke distance experienced by tire member 209 is greater than the relative stroke experienced in the shock absorber portion along shock strut axis 225 .
  • a distance D1 represents a vertical distance experienced by tire member 209 between the static position and the fully compressed position.
  • a distance D2 represents a vertical distance experienced by tire member 209 between the static position and the fully extended position.
  • a distance D3 represents a strut axis distance experienced by piston rod 229 between the static position and the fully compressed position.
  • a distance D4 represents a strut axis distance experienced by piston rod 229 between the static position and the fully extended position.
  • the ratio of D1 to D3 and D2 to D4 are each approximately 1 inch to 0.75 inch.
  • One technical advantage of landing gear system 113 is that maximizing the vertical stroke distance of tire member 209 , while minimizing the strut axis distance, can result in a more efficient landing gear system.
  • Drag brace assembly 205 includes an upper drag brace member 237 and a lower drag brace member 239 pivotally joined at a drag brace hinge 241 at the apex.
  • a lower end portion of lower drag brace member 239 is pivotally coupled to collar 223 .
  • An upper end portion of upper drag brace member 237 is pivotally coupled to a spindle 243 that is rotatably received by an airframe 245 .
  • the location of spindle 243 forms a spindle axis 247 at the axial centerline.
  • Spindle axis 247 traverses through the intersection point B of the centerline axis 225 and retraction rotation axis 221 .
  • Actuator 201 is pivotally coupled to upper drag brace member 239 at a connection portion 249 . Actuator 201 is also pivotally coupled to a portion of the airframe of fuselage 107 . Actuator 201 is configured to selectively retract and extend strut assembly 203 .
  • actuator 201 is an electromechanical actuator; however, it should be appreciated that the exact type of actuator 201 is implementation specific and that one of ordinary skill in the art with benefit of this disclosure will recognize that any variety of actuator types may be suitable.
  • landing gear system 113 is illustrated in the retracted or stowed position to illustrate the dynamics of folding landing gear system 113 about retraction rotation axis 221 via actuator 101 .
  • a retracting actuation of actuator 201 acts to fold drag brace assembly 205 about hinge 241 , thereby causing strut assembly 203 and radius rod 207 to rotate about retraction rotation axis 221 until landing gear system 113 is compactly stowed.
  • an upper portion of radius rod 207 is rotatably coupled to an airframe 251 via a trunnion 253 .
  • a centerline of trunnion 253 corresponds with retraction rotation axis 221 .
  • a lower portion of radius rod 207 is rotatably coupled to an upper torque arm 255 at an attachment member 259 .
  • An upper portion of upper torque arm 255 is hingedly coupled to fixed length portion 211 of strut assembly 203 at a pin joint on a fixed bracket 261 .
  • a lower portion of lower torque arm 257 is hingedly coupled to a bracket 263 that is fixed relative to piston rod 229 .
  • Upper torque arm 255 and lower torque arm 257 join piston rod 229 and housing 227 , so as to function as a toggle joint as piston rod 229 translates relative to housing 227 along centerline axis 225 .
  • Upper torque arm 255 and lower torque arm 257 are configured to collectively inhibit rotation of piston rod 229 about centerline axis 225 relative to housing 227 , while partially providing a controlling force between piston rod 229 and housing 227 during relative translation therebetween.
  • the geometric orientation of radius rod 207 , upper torque arm 255 , and lower torque arm 257 collectively act to implement desired inboard/outboard movement of spindle 243 during a stroke of landing gear system 113 , as further disclosed herein.
  • the geometric configuration of landing gear system 113 causes tire member 209 to move or roll in fore/aft direction along a stroke path during a stroke translation of piston rod 229 relative to housing 227 of the shock absorber, thereby reducing tire scrubbing and providing a smooth stroking during dynamic operation of landing gear system 113 .
  • the primary positions of tire member 209 during non-retracted operation are: a fully extended position A′, a static position A, and a fully compressed position A′′. Positions A′, A, and A′′ are illustrated as a point at the center of tire member 209 on axle spindle axis 233 .
  • the center of tire member 209 can travel along a stroke path 265 between positions A′, A, and A′′.
  • Fully extended position A′ can be defined as the location of the center of tire member 209 when landing gear system is extended (not retracted), but does not experience any ground loading.
  • Static position A can be defined as the location of the center of tire member 209 while the aircraft is resting on the ground so as to experience a steady state load incurred by the weight of the aircraft.
  • Fully compressed position A′′ can be defined as the location of the center of tire member 209 at maximum compression of the shock absorber during the initial landing of the aircraft on the ground surface. It should be appreciated that a variety of factors and operational conditions can affect the exact location of positions A′, A, and A′′, as one of ordinary skill in the art would appreciate having the benefit of this disclosure.
  • stroke path 265 includes a significant amount of travel in the fore/aft direction, which limits the amounts the amount of inboard/outboard travel that could otherwise result in tire scrubbing. Further, the fore/aft travel along stroke path 265 can act to negate scrubbing that would otherwise result from substantial inboard/outboard travel during a stroking of the shock absorber.
  • the fore/aft travel of tire member along stroke path 265 is derived from drag brace assembly 205 being rotatably coupled to airframe 245 with spindle 243 , the spindle axis 247 having a common intersection point B with centerline axis 225 (strut stroking axis) and retraction rotation axis 221 .
  • the configuration of spindle axis 247 having common intersection point B with centerline axis 225 (strut stroking axis) and retraction rotation axis 221 causes tire member 209 to move forward (so as to roll) along stroke path 265 , from position A′ to position A′′, during a stroking compression of the shock absorber.
  • stroke path 265 represents the travel of the center of axle spindle axis between positions A′, A, and A′′ during a compression of the shock absorber.
  • stroke path 265 includes a substantial amount of travel in the fore/aft directions and a minimal amount of travel in the inboard/outboard directions.
  • the rolling (fore/aft movement) of tire member 209 can act to alleviate scrubbing that may otherwise result from a pure inboard/outboard movement of tire member 209 .
  • the relatively small amount of inboard/outboard movement (as best shown in FIG. 8 ) along stroke path 265 can be attributed to the four bar linkage created by radius rod 207 , upper torque arm 255 , strut assembly 203 , and the airframe.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Tires In General (AREA)
US13/531,650 2012-06-25 2012-06-25 Semi-levered articulated landing gear system Active 2032-10-24 US8752785B2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US13/531,650 US8752785B2 (en) 2012-06-25 2012-06-25 Semi-levered articulated landing gear system
EP12190536.8A EP2679488B1 (fr) 2012-06-25 2012-10-30 Système de train d'atterrissage à semi-levier
CA2818053A CA2818053C (fr) 2012-06-25 2013-06-04 Systeme de train d'atterrissage articule partiellement manoeuvre
BR102013014832A BR102013014832A2 (pt) 2012-06-25 2013-06-13 aeronave e sistema de trem de pouso para a mesma

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Application Number Priority Date Filing Date Title
US13/531,650 US8752785B2 (en) 2012-06-25 2012-06-25 Semi-levered articulated landing gear system

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US20130341457A1 US20130341457A1 (en) 2013-12-26
US8752785B2 true US8752785B2 (en) 2014-06-17

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US (1) US8752785B2 (fr)
EP (1) EP2679488B1 (fr)
BR (1) BR102013014832A2 (fr)
CA (1) CA2818053C (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11155345B2 (en) * 2019-11-11 2021-10-26 Goodrich Corporation Side folding and reforming linkage for landing gear
US20230373650A1 (en) * 2022-05-23 2023-11-23 Safran Landing Systems Canada Inc. Landing gear load measurement system

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10384767B2 (en) * 2017-01-25 2019-08-20 The Boeing Company Single axle, semi-levered landing gear with shortening mechanism
US10625849B2 (en) 2017-04-11 2020-04-21 The Boeing Company Levered landing gear with inner shock strut
US10549848B2 (en) * 2017-04-26 2020-02-04 Safran Landing Systems Canada Inc. Deployable and retractable shock strut
US10800516B2 (en) 2017-06-02 2020-10-13 The Boeing Company Semi-levered shrink landing gear
US11161599B2 (en) 2018-01-26 2021-11-02 The Boeing Company Landing gear strut assembly and method therefor
US10981646B2 (en) 2018-07-30 2021-04-20 The Boeing Company Landing gear shrink link mechanism
CN111891340B (zh) * 2020-06-17 2022-04-08 成都飞机工业（集团）有限责任公司 一种基于四杆机构运作的起落架收放作动装置
CN112373679A (zh) * 2020-10-15 2021-02-19 南京航空航天大学 一种飞机起落架轮胎防磨损装置
CN112623281B (zh) * 2020-12-07 2022-07-05 北京空间机电研究所 一种冗余驱动的大自折角支撑锁定展收装置

Citations (20)

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Publication number Priority date Publication date Assignee Title
US2691496A (en) * 1950-05-12 1954-10-12 United Aircraft Corp Aircraft landing gear
US3822048A (en) * 1973-03-02 1974-07-02 Pneumo Dynamics Corp Main landing gear
US3951361A (en) * 1975-06-23 1976-04-20 Pneumo Corporation Articulated main landing gear
US4047681A (en) 1975-12-22 1977-09-13 The Boeing Company Apparatus for shortening the strut of a pivotally retractable aircraft landing gear during gear retraction
US4170332A (en) 1977-02-23 1979-10-09 Messier-Hispano-Bugatti Retractable undercarriage especially for the fuselage of an aircraft
US4552324A (en) * 1983-05-31 1985-11-12 Pneumo Corporation Landing gear mechanism for use on rough runways
US4892270A (en) * 1987-06-09 1990-01-09 Messier-Haspano-Bugatti Rocking beam landing gear
US4984755A (en) 1989-02-28 1991-01-15 Messier-Hispano-Bugatti Aircraft landing gear having wheels that swivel while the landing gear is being retracted
EP0564772A1 (fr) 1992-04-07 1993-10-13 Deutsche Aerospace Airbus Gesellschaft mit beschränkter Haftung Train d'atterrissage principal pour un avion avec centre de gravité en arrière
US5478030A (en) * 1993-07-15 1995-12-26 Messier-Eram Laterally-raisable aircraft landing gear
US20040262452A1 (en) * 2000-03-02 2004-12-30 Messier-Dowty Sa Aircraft landing gear
US20060006282A1 (en) * 2004-06-25 2006-01-12 The Boeing Company Apparatus and method for predictable movement of structural components during failure
US20090050736A1 (en) 2005-08-04 2009-02-26 Messier-Dowty Limited Landing gear
US20090108131A1 (en) * 2004-06-18 2009-04-30 Goodrich Corporation Retractable articulated landing gear
US20100012778A1 (en) * 2008-07-10 2010-01-21 Airbus Operations Ltd. Torque link set
US20110147518A1 (en) * 2009-11-04 2011-06-23 Fabio Nannoni Aircraft Landing Gear
US20110155845A1 (en) * 2009-12-30 2011-06-30 Agusta S.P.A. Retractable helicopter landing gear
US20110233327A1 (en) * 2010-03-24 2011-09-29 The Boeing Company Semi-levered landing gear and associated method
US20120056035A1 (en) * 2010-09-08 2012-03-08 Goodrich Corporation Shrink shock strut locking mechanism for retractable aircraft landing gear
US8186620B2 (en) 2008-06-25 2012-05-29 Goodrich Corporation Adjustable landing gear system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2691496A (en) * 1950-05-12 1954-10-12 United Aircraft Corp Aircraft landing gear
US3822048A (en) * 1973-03-02 1974-07-02 Pneumo Dynamics Corp Main landing gear
US3951361A (en) * 1975-06-23 1976-04-20 Pneumo Corporation Articulated main landing gear
US4047681A (en) 1975-12-22 1977-09-13 The Boeing Company Apparatus for shortening the strut of a pivotally retractable aircraft landing gear during gear retraction
US4170332A (en) 1977-02-23 1979-10-09 Messier-Hispano-Bugatti Retractable undercarriage especially for the fuselage of an aircraft
US4552324A (en) * 1983-05-31 1985-11-12 Pneumo Corporation Landing gear mechanism for use on rough runways
US4892270A (en) * 1987-06-09 1990-01-09 Messier-Haspano-Bugatti Rocking beam landing gear
US4984755A (en) 1989-02-28 1991-01-15 Messier-Hispano-Bugatti Aircraft landing gear having wheels that swivel while the landing gear is being retracted
EP0564772A1 (fr) 1992-04-07 1993-10-13 Deutsche Aerospace Airbus Gesellschaft mit beschränkter Haftung Train d'atterrissage principal pour un avion avec centre de gravité en arrière
US5478030A (en) * 1993-07-15 1995-12-26 Messier-Eram Laterally-raisable aircraft landing gear
US20040262452A1 (en) * 2000-03-02 2004-12-30 Messier-Dowty Sa Aircraft landing gear
US20090108131A1 (en) * 2004-06-18 2009-04-30 Goodrich Corporation Retractable articulated landing gear
US20060006282A1 (en) * 2004-06-25 2006-01-12 The Boeing Company Apparatus and method for predictable movement of structural components during failure
US20090050736A1 (en) 2005-08-04 2009-02-26 Messier-Dowty Limited Landing gear
US20120091271A1 (en) * 2005-08-04 2012-04-19 Messier-Dowty Limited Landing gear
US8186620B2 (en) 2008-06-25 2012-05-29 Goodrich Corporation Adjustable landing gear system
US20100012778A1 (en) * 2008-07-10 2010-01-21 Airbus Operations Ltd. Torque link set
US20110147518A1 (en) * 2009-11-04 2011-06-23 Fabio Nannoni Aircraft Landing Gear
US20110155845A1 (en) * 2009-12-30 2011-06-30 Agusta S.P.A. Retractable helicopter landing gear
US20110233327A1 (en) * 2010-03-24 2011-09-29 The Boeing Company Semi-levered landing gear and associated method
US20120056035A1 (en) * 2010-09-08 2012-03-08 Goodrich Corporation Shrink shock strut locking mechanism for retractable aircraft landing gear

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11155345B2 (en) * 2019-11-11 2021-10-26 Goodrich Corporation Side folding and reforming linkage for landing gear
US20230373650A1 (en) * 2022-05-23 2023-11-23 Safran Landing Systems Canada Inc. Landing gear load measurement system

Also Published As

Publication number Publication date
BR102013014832A2 (pt) 2015-09-08
CA2818053C (fr) 2016-02-23
EP2679488A1 (fr) 2014-01-01
CA2818053A1 (fr) 2013-12-25
EP2679488B1 (fr) 2014-06-25
US20130341457A1 (en) 2013-12-26

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